Fluid micro-injection device and flow channel assembly

Abstract

A flow channel assembly ( 200 ) of a fluid micro-injection device have a fluid seat ( 210 ), a nozzle ( 220 ) and a fluid supply joint ( 230 ), the fluid seat ( 210 ) defines a fluid chamber ( 211 ) and a flow channel ( 212 ), which communicates with each other, the nozzle ( 220 ) is in communication with the fluid chamber ( 211 ), the movable member of the fluid micro-injection device movably passes through the fluid chamber ( 211 ) to open and close the nozzle ( 220 ), the fluid supply joint ( 230 ) communicates with the flow channel ( 212 ) to provide fluid to the nozzle ( 220 ) through the flow channel ( 212 ) and the fluid chamber ( 211 ).

What is claimed is: 
     
       1. A flow channel assembly of a fluid micro-injection device, comprising:
 a fluid seat defining a fluid chamber and a flow channel in communication with the fluid chamber therein; 
 a nozzle disposed on the fluid seat and in communication with the fluid chamber; 
 a movable member movably passing through the fluid chamber to open and close the nozzle; and 
 a fluid supply joint communicating with the flow channel to provide fluid to the nozzle through the flow channel and the fluid chamber, 
 wherein the flow channel assembly further comprises a fluid chamber seal disposed in the fluid chamber and located at an upper end of the fluid chamber to close the upper end of the fluid chamber, the fluid chamber seal is provided with an inner hole extending therethrough in an axial direction thereof, and the movable member extends through the inner hole into the fluid chamber. 
 
     
     
       2. The flow channel assembly according to  claim 1 , further comprising:
 an adapter defining a flow guiding passage therein, wherein 
 the adapter is connected to the fluid seat and the flow guiding passage is in communication with the flow channel, and the fluid supply joint is disposed on the adapter and communicates with the flow guiding passage. 
 
     
     
       3. The flow channel assembly according to  claim 2 , wherein seal rings are disposed between the adapter and the fluid supply joint and between the adapter and the fluid seat respectively. 
     
     
       4. The flow channel assembly according to  claim 2 , wherein the adapter and the fluid seat are connected by a screw. 
     
     
       5. The flow channel assembly according to  claim 4 , wherein the fluid seat is provided with a first assembly ramp extending slantedly with respect to a horizontal direction, and the adapter is provided with a second assembly ramp that fits with the first assembly ramp, the screw passes through the adapter and the fluid seat to compress the first assembly ramp and the second assembly ramp. 
     
     
       6. The flow channel assembly according to  claim 5 , wherein the first assembly ramp is provided with a positioning recess, and the second assembly ramp is provided with a positioning boss corresponding to the positioning recess, and the positioning boss is inserted into the positioning recess. 
     
     
       7. The flow channel assembly according to  claim 6 , wherein an opening of the positioning recess is formed with an acute angle and a bottom surface of the positioning recess extends in the horizontal direction. 
     
     
       8. The flow channel assembly according to  claim 2 , wherein the flow channel extends slantedly with respect to a horizontal direction, the flow guiding passage extends along a vertical direction, a lower end of the flow channel communicates with the fluid chamber, and an upper end of the flow channel communicates with a lower end of the flow guiding passage. 
     
     
       9. A fluid micro-injection device comprising a flow channel assembly according to  claim 2 . 
     
     
       10. The flow channel assembly according to  claim 1 , wherein the upper end of the fluid chamber is formed in a stepped shape, and the fluid chamber seal comprises:
 an outer cylinder having a shape corresponding to a shape of the upper end of the fluid chamber to be fitted at the upper end of the fluid chamber; and 
 an inner cylinder having a radial dimension smaller than a radial dimension of the outer cylinder, the inner cylinder being disposed in the outer cylinder and elastically connected to the outer cylinder, the inner cylinder being provided with the inner hole that penetrates through the inner cylinder in an axial direction thereof. 
 
     
     
       11. The flow channel assembly according to  claim 10 , wherein the inner cylinder and the outer cylinder are connected by a bending elbow member. 
     
     
       12. The flow channel assembly according to  claim 1 , further comprising:
 a sealing seat disposed on the fluid seat between the fluid chamber seal and the nozzle, the sealing seat being provided with a guiding passage penetrating through the sealing seat in an axial direction thereof, the nozzle and the sealing seat are connected and in communication with the guide passage, and the movable member passes through the guide passage and is movable along the axial direction of the guide passage to open and close the nozzle. 
 
     
     
       13. The flow channel assembly according to  claim 12 , wherein a cross section of the guiding passage is formed as a flower-shaped cross section. 
     
     
       14. The flow channel assembly according to  claim 12 , wherein a bottom of the sealing seat is provided with a positioning step, the nozzle is provided with a positioning protrusion corresponding to the positioning step, and the positioning protrusion is embedded in the positioning step. 
     
     
       15. The flow channel assembly according to  claim 12 , further comprising:
 a threaded sleeve, wherein the nozzle and the sealing seat are mounted on the fluid seat by the threaded sleeve. 
 
     
     
       16. The flow channel assembly according to  claim 1 , wherein the nozzle defines an injection passage that penetrates along an up-down direction of the injection passage, and an upper end of the injection passage is formed as a tapered surface fitting with a lower end surface of the movable member. 
     
     
       17. The flow channel assembly according to  claim 16 , wherein a lower end of the injection passage is provided with micro-holes. 
     
     
       18. The flow channel assembly according to  claim 17 , wherein a lower end of the nozzle is provided with a tapered boss, and the micro-holes are provided in the tapered boss. 
     
     
       19. A fluid micro-injection device comprising a flow channel assembly according to  claim 1 .